#include "Nguoi.h"
#include "NguoiAnh.h"
#include "NguoiViet.h"
#include <conio.h>

int main()
{
	Nguoi *n;
	NguoiViet nv;
	NguoiAnh na;
	n = &nv;
	n->Chao();
	n = &na;
	n->Chao();
	_getch();
	return 0;

}